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Juglans
See list of 3 species in this genus-
1a. Carpellate inflorescence with 2–5 flowers; leaf scar lacking a pubescent band along the upper margin; branchlets with light brown pith; drupes solitary or paired, globose to subglobse; leaflets usually somewhat glossy and ± glabrous when mature
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1b. Carpellate inflorescence with 5–20 flowers; leaf scar with a transverse, pubescent band along the upper margin; branchlets with light or dark brown pith; drupes in racemes of (2–) 3–7 or more, ovoid to ovoid-obloid (sometimes subglobose in J. ailantifolia) [Fig. 689]; leaflets usually dull and at least sparingly pubescent adaxially
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2a. Branchlets with dark brown pith, with relatively thick diaphragms that are nearly as broad as the chambers they alternate with; upper margin of leaf scar straight or scarcely notched; staminate aments 5–8 cm long; exterior of endocarp (i.e., shell) strongly 6- to 8-ridged and with irregular, ± sharp crests and projections
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2b. Branchlets with light brown pith, with thin diaphragms that are much narrower than the chambers they alternate with; upper margin of leaf scar with a conspicuous notch; staminate aments 15–30 cm long; exterior of endocarp rugose
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